Reviews in Chemical Engineering, Vol.29, No.2, 99-122, 2013
Microwave synthesis of SAPO molecular sieves
During the past decade, a significant progress has been achieved in the microwave synthesis of silicoaluminophosphate (SAPO) molecular sieves. This review attempts to summarize the recent developments and achievements in the microwave synthesis of SAPO molecular sieves, especially SAPO-34, SAPO-5, and SAPO-11. It also focuses mainly on the effects of the microwave parameters, such as microwave time, temperature, and power, on the SAPO formation in terms of the crystallinity, size, purity, and morphology of crystals. In addition, the microwave synthesis of metal SAPO and metal ion-exchanged SAPO materials is briefly introduced. The general overviews demonstrate that the best results for the synthesis of pure and small SAPO crystals with narrow particle size distribution have been obtained from samples prepared at appropriate temperatures for an optimum amount of time through a pulsed microwave heating technique at higher power levels.